A current -carrying loop of irregular shape is located in an external magnetic field. If the wire is flexible, why does it becomes circular?

A loop of irregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular shape ? What could be the sense of current in the loop and the direction of magnetic field ?

(a) A current-carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up in such a manner that the loop turns around itself (i.e., turns about the vertical axis). (b) A current-carrying circular loop is located in a uniform external magnetic field. If the loop is free to turn, what is its orientation of stable equilibrium? Show that in this orientation, the flux of the total field (external field + field produced by the loop) is maximum. (c) A loop of irregular shape carrying current is located in an external magnetic field. If the wire is flexible, why does it change to a circular shape?

A current-carrying circular loop is located in a uniform external magnetic field. If the loop is free to turn, what is its orientation of stable equilibrium ? Show that in this orientation, the flux of the total field (external field + field produced By the loop) is maximum.

A current loop in a magnetic field

(A) : A current carrying circular loop, free to turn, when placed in an external magnetic field, orients its plane normal to field. (R) : The potential energy of the system is minimum at stable equilibrium position.

A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes